Lifting device for temper screws



April 14,1925' G A MoN-GOMERY 1,533,751

LIFTING DEVICE FOR\ TEMPER SCREWS Filed April 29. 1924 e 13 e Q e fz!!Jig-1. fj//ffxz if@ j j, J4 .Z3 Zzgl M//l -L- -l,;"| f 50131/ 117, j i./7| l 1,l Illl 579| fz l f r y' n 'u W ,f 'f J' 1 I 7g I 'K l' li ,l "llli Il I 4 Y" Ffa 1y /5 di 1i 7i M f IHIIIIIIIIIIMIII iluiiltlvmmnl fVZ? :"X 76 l 5f j 75 73 'V751 #vz 17 15 j Fi/'94 .i

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l by y L Patented Apr. 14, 1925i.

PATENT OFFICE.

I GUSTAVUS A. MONTGOMERY, 0F TI'IUSVILLE, JEENNSYLVANIA.

LIFTING DEVICE FOR TEMPER SCREWS. l

Application filed. April 29, 1924. Serial No. 709,931.

To all whom t may concern:

Be it known that I, GUsTAvUs A. MONT- GOMERY, a citizen of Finland,residing at Titusville, in the county of Crawford and State ofPennsylvania, have invented new andI useful Improvements in LiftingDevices forV Temper Screws, of which th following is a` specification. i

This invention relates generally to the temper screws employed inconnection with welldrilling apparatus, but more particularly to thelifting mechanism employed therewith. i y

One of its objects is to provide an iinproved lifting orcounterbalancing mechanism for temper screws which is eflicient,reliable and automatic in operation.

Other objects of the invention are to. provide a device of thischaracter which is l simple, strong and durablel in construction, andwhich is readily applicable to the temper screws now in use withoutmaterially altering` their construction.

In' the accompanying drawings:

Figure 1 is a longitudinal sectional view of the device, taken in theplane of line l-1, Fig. 2. Figure 2 is a horizontal section on line 2 2,Fig. 1. Figures 3 and .4; are transverse vertical sections taken on thecorrespondinglynumbered lines in Fig. 1.

Similar characters of reference'indicate corresponding parts throughoutthe several views.

Referring now to the drawings, the numeral 10 indicates the temper screwwhich may be of any well-known construction, being provided at its upperend with the customary cross bar 11 seated in the saddleplates 12secured to the front end of the walking beam 13 of the drillingapparatus. The stem 14 of the temper screw has a vcrtical bore 15through which the suspension cable16 passes, the latter being fastenedat its lower end to an eye 17 or other appropriate coupling attached tothe upper end of the temper screw.

The improved lifting mechanism is preferablymounted on the walking beamnear the front end thereofand consistsof a longitudinally divided casingor housing of two sections 18, 19jointed by bolts 20 and se-4 curelyfastened toy said walking beam by bolts 21 or other suitable fastenings.This casing is closed on all sides with the .excepand meshes with a gear26 secured to a re-v wind shaft 27. parallel to said drum-shaft and`iournaled in the rear portion of the casing.

Means are provided for. automatically impart-ing motion to the rewindshaft 27 and rotating the sheave 24- in the proper direction to elevatethe temper screw whenever the vcustomary screw-operating mechanism (notshown) is disengagedtherefrom. For

this purpose, the rewind shaft has a pinion 28 thereon which engages ,ahorizontally.;

disposed gear-rack 29 movable lengthwise of the casing and the walkingybeam. This gear-rachis guided in an opening 30 formed in an extension 31of the casing-section 18. and is adapted to project intoa cylindricalportion 32 disposed in rear of and longitudinally inline with saidextension. Aft its rear end the gear-rack` is provided with a rod 33having a washer 34.- anda nut 35 at its free end, and interposed betweensaid washer and an inturned iiange 36 located at the intersection of theextension 31 with its `cylindrical portion 32 is a coiled spring 37which tends constantly to move said gear-rack rearwardly for rotatingthe sheave 24 in a counter-clockwise direction to elevate the temperscrew. A screw-plug 38 is applied to the vopen rear end of saidcylindrical portion against which the washer 34: is adapted to abut forlimiting the rearward movement of the. rack.

Briefly stated, the operation of the dcvice is as follows, assumingtheparts to be in their normal position, as shownfby full lines in thedrawings, wherein the temper r screw 10 is in its elevated position andthe gear-rack 29 in its extreme rearward posi-- tion. lVhen loweringvthe temper screw by means of the usual screw-operating mechanism, thesheave 24 is rotated in a cloclwise direct-ion andthrough the medium ofthe reduction gearing 25, 26 and 28 the rack is moved forwardly in thedirection of the arrow, Fig. l, compressing the spring 3T. lVhen thescrew reaches its extreme lower position and its operating mechanismisre'- leased, thespring causes the automatic return of the` screw to itsinitial position.

This improved screw-elevating device is simple and compact inconstruction, it can be readily employed in connection with eX- is'tingtemper screws by simply drilling the cable-passages l5 in the stemsthereof, and its parts are so organizediand arranged that they `are notliable to get out of order. Furthermore, all parts of the device areenclosed and out. of the way where `they do not interfere with `thoseworking around the drilling apparatus.

I claim as my invention:

1. The combination with the walking beam of a drilling apparatus and thetemper screw supported thereby, of an elevating device for the temperscrew, comprising a casing mounted on the walking beam, a winding drumcarried by said casing, a flexible member connected at one end to Asaidtemper screw and at its other end to said drum, and 'means in saidcasing operatively connected` to said drum and tending constantly torotate the latter in a direction to 'elevate the temper screw.

2. The combination with the walking ybeam of a drilling apparatus andthe 'temper screw supported thereby, :of an elevating vdevice for thetemper screw, comprising a casing mounted on the `walking beam, a i

'winding drum carried by said casing, a flexible member connected Iatone end to 1said 'temper screw and lat its other end to said drum, 'anda yieldable member in said casing'opera-tively connected to said drum-for resisting rotation of the latter in a di,- rection to lower thetemper screw. V '3. 'The combination with the walking 'beam of adrilling apparatus and the temper l,screw supported thereby, of anelevating device for the temper screw, comprising a 'casingyn`1oiintedon-the walking beam, a winding* drum carried by said casing,'a `flexible member connected at one end to said temper screw `and atits other end to 'said drum, 'a 'yielda'ble member guided in said casing'for movement lengthwise thereof, 'and driving mechanism interposedbetween said drum and'said yieldable member, the latter resistingrotation of the drum^in a direction to flower the 'temper screw.

4. yThe combination with the -walking ibeamfof fa drilling apparatus'and the temper screw supported thereby, of an elevating device for thetemper screw, comprising a casing rmounted on the walking beam, awinding drum carried by said casing, a flexible member connected at oneend to said temper :screw and at its other'v end to said drum` a gearrack guided in said casing for movement lengthwise thereof, gearinginterposed between said drun'ifa'ndsaid gear rack, and means tending tourge said rack in a direction to elevate the temper screw.

5. The combination with the walking beam of a drilling apparatus and thetemper screw supported thereby, of lan elevating device for the temperscrew, comprising a casing' mounted on the walking beam, a winding` drumcarried by said casing, 'a flexible member connected at one end to saidtemper screw and at its other end to said drum, a gear rack guided insaid casing for movement lengthwise thereof, reduction gearinginterposed between said drum and said gear rack` anda coil springapplied to sai-d rack for moving the same in a direction to elevate thetemper screw.

6. The combination with the walking beam of a drilling apparatus and thetemper screw supported thereby, of an elevating device for the temperscrew, comprising a casing mounted on the walking beamk and having anextension at one side thereof, a winding drum mounted in said casing andhaving a cable wound -thereon connected at its free end to the temperscrew, a gear rack guided in said casing-extension for movementlengthwise thereof, reduction `gearing in the casing and interposedbetween sai-d drum and said gear rack, and a coil spring` applied tosaid rack for moving the same in a direction to elevate the temperscrew.

7. An automatic lifting device for temper screws` comprising a casing. awinding drum journaled in said casing and, adapted for connection withthe temper screw, a springpressed gear rack operatively connected withsaid drum and tending constantly to rotate it in a direction to .liftthe temper screw, and gearing between said drum and said rack.

8. An automatic lifting device for temper screws, comprising a casing,parallel shafts journaled in said casing, a winding drum mounted on oneof said shafts and including a cable adapted for connection with thetem- `.per screw, a pinion on said drum-shaft, a gear and pinion mountedon `the other shaft,

`said gear meshing' with said drumshaft pinion, a gear rack guided 'onsaid casing and meshing with the pinion of said secondname'd shaft, andmeans engaging said rack and tending constantly to move it in adirection to 'lift the temperscrew y.

` 9. Anautomatic lifting device for temper screws, comprising a casingconstructed of jointed sections, one of the sections Carrying imextension, parallel shafts journaled in said Casing, a Winding drummounted on one of said shafts and including a cable adapte-d forconnection with the temper screw, a

)inion on Said drum-shaft a O'ear and inion mounted on the other shaft,said gear meshing with said drum-shaft pinion, a gear rack guided inSaid section-extension and meshing with the pinion of said second-named10 shaft, and u coil spring Contained in said extension and applied tosaidgear reel; for constantly urgiiigthe latter in a direction to liftthe temper screw.

GUSTAVUS A. MONTGOMERY.

